KPA500 on AM...

[Macy monkeys]

One more question then I'll go back into hibernation. What is considered a safe drive level for the KPA500 when operating AM? I haven't tried it yet but I imagine the cooling fan goes into jet takeoff mode.

Thanks, John K7FD
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[Don Wilhelm]

John,

The KPA500 is rated for 500 watts PEP.
With AM, that is 250 watts carrier, and 250 watts of sideband energy
(125 watts for each sideband).  So your "talk power" is 125 watts,
compared to 500 watts SSB.

Note that is for 10 minutes transmit with a 5 minute receive period.  If
you are "long winded" and want to exceed that 10 minutes keydown, you
should reduce the power.

See the specifications.  If you want to exceed the specification limits,
you do so at your own peril, although the KPA500 has means to protect
itself.

73,
Don W3FPR


On 1/19/2020 12:43 PM, Macy monkeys wrote:
>
> One more question then I'll go back into hibernation. What is considered a safe drive level for the KPA500 when operating AM? I haven't tried it yet but I imagine the cooling fan goes into jet takeoff mode.
>
> Thanks, John K7FD
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[K9MA]

Isn't peak power for AM 4 times the average (carrier) power?

73,

Scott K9MA


On 1/23/2020 18:10, Don Wilhelm wrote:

> John,
>
> The KPA500 is rated for 500 watts PEP.
> With AM, that is 250 watts carrier, and 250 watts of sideband energy
> (125 watts for each sideband).  So your "talk power" is 125 watts,
> compared to 500 watts SSB.
>
> Note that is for 10 minutes transmit with a 5 minute receive period. 
> If you are "long winded" and want to exceed that 10 minutes keydown,
> you should reduce the power.
>
> See the specifications.  If you want to exceed the specification
> limits, you do so at your own peril, although the KPA500 has means to
> protect itself.
>
> 73,
> Don W3FPR
>
>
> On 1/19/2020 12:43 PM, Macy monkeys wrote:
>>
>> One more question then I'll go back into hibernation. What is
>> considered a safe drive level for the KPA500 when operating AM? I
>> haven't tried it yet but I imagine the cooling fan goes into jet
>> takeoff mode.
>>
>> Thanks, John K7FD
> ______________________________________________________________
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--
Scott  K9MA

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[Grant Youngman-2]

Yes.  You wouldn’t want to run a KPA500 at any more than around 125W carrier output.  Maybe a bit less to give you some headroom.  At 250W carrier the KPA500 would be pushed way beyond ratings on AM.

Grant NQ5T

> On Jan 23, 2020, at 7:59 PM, K9MA <[hidden email]> wrote:
>
> Isn't peak power for AM 4 times the average (carrier) power?
>
> 73,
>
> Scott K9MA
>
>
> On 1/23/2020 18:10, Don Wilhelm wrote:
>> John,
>>
>> The KPA500 is rated for 500 watts PEP.
>> With AM, that is 250 watts carrier, and 250 watts of sideband energy (125 watts for each sideband).  So your "talk power" is 125 watts, compared to 500 watts SSB.
>>
>> Note that is for 10 minutes transmit with a 5 minute receive period.  If you are "long winded" and want to exceed that 10 minutes keydown, you should reduce the power.
>>
>> See the specifications.  If you want to exceed the specification limits, you do so at your own peril, although the KPA500 has means to protect itself.
>>
>> 73,
>> Don W3FPR
>>
>>
>> On 1/19/2020 12:43 PM, Macy monkeys wrote:
>>>
>>> One more question then I'll go back into hibernation. What is considered a safe drive level for the KPA500 when operating AM? I haven't tried it yet but I imagine the cooling fan goes into jet takeoff mode.
>>>
>>> Thanks, John K7FD
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>
>
> --
> Scott  K9MA
>
> [hidden email]
>
> ______________________________________________________________
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